JP7094697B2 - Battery pack - Google Patents

Description

The present invention relates to a battery pack.

As an example of the above-mentioned battery pack, for example, the batteries described in Patent Documents 1 and 2 have been proposed. In the batteries described in Patent Documents 1 and 2, in order to maintain airtightness, a bolt (external terminal) for connecting to the outside and a bus bar for connecting to the electrode of the battery body are integrally molded on the lid portion. There is. For this reason, before the battery body is housed in the case body, the electrodes of the battery body and the bus bar are connected, and the battery body with the lid attached is housed in the case body, so that it is not easy to assemble. was there.

It is also conceivable to attach an external terminal after attaching the lid to the case body. However, in this case, there is a problem that the airtight treatment between the external terminal and the lid portion becomes difficult.

Japanese Unexamined Patent Publication No. 2013-4443 Japanese Unexamined Patent Publication No. 2016-105411

The present invention has been made in view of the above background, and an object of the present invention is to provide a battery pack that can be easily airtightly treated and assembled.

The battery pack of the present invention has a battery, an accommodating portion for accommodating the battery, an outer cover that covers the accommodating portion and to which an external terminal is attached, and is attached to the accommodating portion and electrically connected to the battery. A first conductive member and a second conductive member attached to the outer cover and electrically connected to the external terminal are provided, and the outer cover is provided with a first through hole, and the first through hole is provided. It is characterized in that the first conductive member and the second conductive member are electrically connected by a first bolt passing through a hole.

Further, the accommodating portion has an accommodating portion main body for accommodating the battery and an inner cover for covering the outer cover side of the accommodating portion main body, and the first bolt is screwed into the inner cover. A first screw hole is provided, the first conductive member is arranged on the outer cover side on the inner cover, and the first bolt penetrates the first conductive member and the second conductive member. The first conductive member and the second conductive member may be connected by screwing into the first screw hole.

Further, a third conductive member attached to the battery is further provided, the inner cover is provided with a second through hole, and the third conductive member projects toward the outer cover side through the second through hole. The first conductive member may be directly or indirectly connected to the third conductive member protruding from the inner cover toward the outer cover.

Further, the first conductive member is an electric component provided with a pair of second screw holes, and the first bolt is a pair of second screw holes of the electric component in a state of penetrating the second conductive member. The second conductive member and the electric component may be connected by screwing to one of them.

Further, a third conductive member attached to the battery is further provided, and the accommodating portion has an accommodating portion main body for accommodating the battery and an inner cover for covering the outer cover side of the accommodating portion main body. The inner cover is provided with a second through hole, the third conductive member projects toward the outer cover side through the second through hole, and the electrical component projects from the inner cover toward the outer cover side. It may be connected to the third conductive member by screwing the second bolt into the other of the pair of second screw holes while penetrating the third conductive member.

Further, the electric component is mounted on the inner cover so that the second screw hole is in a direction parallel to the inner cover, and the outer cover is provided with a protruding portion protruding outward and a side surface of the protruding portion. May be provided with the first through hole.

As described above, according to the invention, after the outer cover is attached to the accommodating portion, the first conductive member and the second conductive member can be connected to electrically connect the external terminal and the battery. Therefore, airtight processing and assembly are easy.

It is sectional drawing of the battery pack in 1st Embodiment. It is an exploded sectional view of the battery pack shown in FIG. It is sectional drawing of the battery pack in 2nd Embodiment. It is an exploded sectional view of the battery pack shown in FIG.

(First Embodiment)
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in the figure, the battery pack 1 includes a lower module 2, an upper module 3, a bolt 4, an O-ring 5, and an insulating cover 6. First, the lower module 2 will be described. The lower module 2 includes a battery 21 as a battery, a lower cover 22 as an accommodating portion, a circuit breaker 23 as an electric component, first to third lower module bus bars 24 to 26, and bolts 27 and 28. is doing.

The batteries 21 are provided in a box shape, and a plurality of batteries 21 are arranged side by side in the left-right direction in the drawing and housed in a lower cover 22 described later. A pair of electrodes (positive electrode, negative electrode) are provided on the upper surface of each of the batteries 21. When the electrodes of the adjacent batteries 21 are connected to each other by the first lower module bus bar 24, the plurality of batteries 21 are connected in series.

The lower cover 22 is composed of an insulating member such as a synthetic resin, and has a lower cover main body 221 that accommodates a plurality of batteries 21 and an inner cover 222 as an inner cover that covers the lower cover main body 221. The lower cover main body 221 has a bottom wall 221A and a peripheral wall 221B erected from the peripheral edge of the bottom wall 221A toward the upper side in the vertical direction in the drawing, and is formed in the shape of a saucer having an open upper portion.

The battery 21 described above is arranged on the bottom wall 221A of the lower cover main body 221 so that the electrodes face the opening of the lower cover main body 221. The bottom wall 221A is formed, for example, in a long rectangular shape in the left-right direction. The peripheral wall 221B is provided upright from the entire peripheral edge of the rectangular bottom wall 221A, and is slightly higher than the height of the battery 21.

The inner cover 222 is provided in the shape of a long rectangular plate in the left-right direction like the bottom wall 221A. The inner cover 222 is attached to the inside of the peripheral wall 221B by locking or adhering so as to cover the opening provided above the lower cover main body 221. Further, in the inner cover 222, a through hole 222A as a second through hole into which a second lower module bus bar 25 as a third conductive member described later is inserted and a metal first through hole 222A into which a bolt 4 described later is screwed are screwed. An insert nut 22B as one screw hole is provided. The through hole 222A is provided so as to penetrate the inner cover 222 in the vertical direction. The insert nut 222B is also insert-molded so that its screw hole penetrates the inner cover 222 in the vertical direction.

The circuit breaker 23 is an electric component that cuts off the overcurrent by fusing when the overcurrent flows through the battery 21. The circuit breaker 23 is arranged above the inner cover 222, and connection portions 231 and 232 are provided on the surfaces facing each other in the left-right direction. The pair of connecting portions 231 and 232 are provided with screw holes (second screw holes) for screwing the second and third lower module bus bars 25 and 26, which will be described later. That is, the pair of screw holes are provided along the left-right direction.

A plurality of first lower module bus bars 24 are provided, and a plurality of batteries 21 are connected in series by connecting electrodes of adjacent batteries 21 to each other.

The second lower module bus bar 25 is attached to an electrode of the battery 21 arranged at one end in the left-right direction (the left end in this embodiment). The second lower module bus bar 25 has a first conductive portion 25A superimposed on the electrode of the battery 21, and a second conductive portion 25B erected from the left end of the first conductive portion 25A toward the upper side in the vertical direction. It is formed in a substantially L shape. The second conductive portion 25B projects upward of the inner cover 222 through the through hole 222A provided in the inner cover 222.

The second conductive portion 25B protruding upward from the inner cover 222 is overlapped with the connection portion 231 on the left side of the circuit breaker 23. The second conductive portion 25B is provided with a through hole 25B1 for penetrating the bolt 27. In the present embodiment, the through hole 25B1 is provided so as to penetrate in the left-right direction. The through hole 25B1 is overlapped with the screw hole provided in the connection portion 231 on the left side. Then, when the bolt 27 is screwed into the screw hole of the connecting portion 231 in a state of being inserted into the through hole 25B1, the second lower module bus bar 25 and the circuit breaker 23 can be electrically connected.

The third lower module bus bar 26 as the first conductive member is erected from the left end of the third conductive portion 26A stacked above the inner cover 222 and the third conductive portion 26A in the vertical direction upward, and the circuit breaker 23 is provided. It has a fourth conductive portion 26B superposed on the connection portion 232 on the right side, and is formed in a substantially L shape. The third conductive portion 26A is provided with a through hole 26A1 for passing the bolt 4 in the portion overlapping the insert nut 222B so as to penetrate in the vertical direction. The fourth conductive portion 26B is provided with a through hole 26B1 for penetrating the bolt 28.

In the present embodiment, the through hole 26B1 is provided so as to penetrate in the left-right direction. The through hole 26B1 is overlapped with the screw hole provided in the connection portion 232 on the right side. Then, when the bolt 28 is screwed into the screw hole of the connecting portion 232 in a state of being inserted into the through hole 26B1, the third lower module bus bar 26 and the circuit breaker 23 can be electrically connected.

Next, the upper module 3 will be described. The upper module 3 includes an upper cover 31 as an outer cover, a terminal 32, a terminal bus bar 33 (second conductive member), and a bolt 34.

The upper cover 31 is made of an insulating member such as synthetic resin, and is attached to the lower cover main body 221 so as to cover the inner cover 222. The upper cover 31 has an upper wall 311 and 312 arranged in two upper and lower stages, a side wall 313 connecting the upper walls 311 and 312 to each other, and a peripheral wall 314 standing from the peripheral edge of the upper walls 311 and 312. , It is formed in the shape of a saucer with an open bottom. The upper wall 311 is arranged in two upper and lower stages so as to face the circuit breaker 23, that is, the upper wall 311 on the left side is on the upper side and the upper wall 312 on the right side is on the lower side. A terminal 32 is airtightly provided on the lower upper wall 312 by using a well-known airtight treatment. Further, the terminal 32 is provided with well-known rotation measures so as not to rotate around the axis. The upper wall 311 and the peripheral wall 314 and the side wall 313 erected from the upper wall 311 constitute a protruding portion 315 protruding outward.

Further, the lower upper wall 312 is provided with a through hole 312A for inserting a bolt 4, which will be described later, so as to penetrate in the vertical direction. When the bolt 4 is fastened to the resin upper cover 31, creep occurs in the upper cover 31 and the fastening force changes. Therefore, a ring-shaped metal collar 312B is fitted in the through hole 312A. The terminal bus bar 33 is stacked below the upper wall 312. The terminal bus bar 33 is provided with a through hole 33A for passing a bolt 34 in a portion overlapping the terminal 32.

When the above-mentioned bolt 34 is inserted into the through hole 33A and screwed into the screw hole provided in the terminal 32, the terminal bus bar 33 and the terminal 32 can be electrically connected. Further, the terminal bus bar 33 is provided with a through hole 33B at a position overlapping with the through hole 312A provided in the upper cover 31 in a state of being connected to the terminal 32 by a bolt 34.

The bolt 4 is screwed into the insert nut 222B provided in the inner cover 222 in a state of penetrating through the through holes 312A, 33B, and 26A1 provided in the upper cover 31, the terminal bus bar 33, and the third lower module bus bar 26. The O-ring 5 is provided between the upper cover 31 and the head of the bolt 34. The insulating cover 6 is attached to the upper cover 31 and covers the head of the bolt 34. The insulating cover 6 has a first plate portion 61 provided so as to be flush with the upper wall 311 and a second plate portion 62 hanging from the right end of the first plate portion 61, and is substantially L. It is formed in a character shape.

Next, the procedure for assembling the battery pack 1 having the above-described configuration will be described. First, the lower module 2 and the upper module 3 are assembled respectively. First, the assembly of the lower module 2 will be described in detail. A plurality of batteries 21 connected in series using the first lower module bus bar 24 are housed in the lower cover main body 221. Next, the first conductive portion 25A of the second lower module bus bar 25 is superposed on the electrode of the battery 21 at the left end.

Next, the inner cover 222 is attached to the inside of the peripheral wall 221B so as to close the opening of the lower cover main body 221. At this time, the second conductive portion 25B is passed through the through hole 222A of the inner cover 222, and the second conductive portion 25B is projected upward from the inner cover 222. Next, the circuit breaker 23 is arranged above the inner cover 222, and the second conductive portion 25B is connected to the connection portion 231 of the circuit breaker 23 by the bolt 27. Further, the third lower module bus bar 26 is connected to the connection portion 232 of the circuit breaker 23 by the bolt 28. This completes the assembly of the lower module 2.

Next, the assembly of the upper module 3 will be described in detail. First, the terminal 32 is attached to the upper cover 31. The terminal 32 may be integrally formed with the upper cover 31 by insert molding or the like. After that, the terminal bus bar 33 is attached to the terminal 32 using the bolt 34. This completes the assembly of the upper module 3.

Next, the upper module 3 is assembled to the lower module 2. At this time, the upper cover 31 is attached to the outside of the peripheral wall 221B of the lower cover main body 221 so as to cover the inner cover 222. When the lower module 2 and the upper module 3 are assembled, the through hole 312A of the upper cover 31, the through hole 33B of the terminal bus bar 33, the through hole 26A1 of the third lower module bus bar 26, and the insert nut 222 of the inner cover 222 overlap with each other.

Next, the bolt 4 is screwed into the insert nut 222B of the inner cover 222 while being inserted into the through hole 312A of the upper cover 31, the through hole 33B of the terminal bus bar 33, and the through hole 26A1 of the third lower module bus bar 26. At this time, the O-ring 5 is sandwiched between the upper cover 31 and the head of the bolt 4. As a result, the terminal bus bar 33 and the third lower module bus bar 26 are electrically connected, and the terminal 32 is electrically connected to the battery 21. After that, the insulating cover 6 is attached to the upper cover 31 so as to cover the head of the bolt 4, and the process is completed.

According to the first embodiment described above, the third lower module bus bar 26 is attached to the lower module 2 and electrically connected to the battery 21, and the terminal bus bar 33 is attached to the upper cover 3 and electrically connected to the terminal. It is connected to the. Further, the upper cover 31 is provided with a through hole 312A, and the third lower module bus bar 26 and the terminal bus bar 33 are electrically connected by a bolt 4 passing through the through hole 312A. As a result, after the battery 21 is housed in the lower module 2, the upper cover 31 can be attached, which facilitates assembly. Further, since the upper cover 31 can be attached to the lower module 2 with the terminal 32 attached, it is not necessary to attach the terminal 32 after attaching the upper cover 31 to the lower module 2, and the airtight treatment is easy. Become.

Further, according to the first embodiment described above, no costly parts are required. Furthermore, it can be assembled with general tools and processes without welding.

Further, according to the first embodiment described above, the inner cover 222 is provided with an insert nut 222B for screwing the bolt 4, and the third lower module bus bar 26 is arranged on the upper cover 31 side on the inner cover 222. The bolt 4 is screwed into the insert nut 222B while penetrating the third lower module bus bar 26 and the terminal bus bar 33 to connect the third lower module bus bar 26 and the terminal bus bar 33. According to the above configuration, the third lower module bus bar 26 and the terminal bus bar 33 can be easily connected by the bolt 4.

Further, according to the first embodiment described above, the inner cover 222 is provided with a through hole 222A, the second lower module bus bar 25 projects to the upper cover 31 side through the through hole 222A, and the terminal bus bar 33 has a through hole 222. It is indirectly connected to the second lower module bus bar 24 protruding toward the upper cover 31 side via the circuit breaker 23. As a result, the second lower module bus bar 25 can be easily connected to the third lower module bus bar 26 arranged on the inner cover 222.

According to the first embodiment described above, the third lower module bus bar 26 and the second lower module bus bar 25 are indirectly connected via the circuit breaker 23, but the present invention is not limited to this. The circuit breaker 23 is not essential, and the third lower module bus bar 26 and the second lower module bus bar 25 may be directly connected.

(Second Embodiment)
Next, the second embodiment will be described below with reference to FIGS. 3 and 4. In addition, in FIGS. 3 and 4, the same reference numerals are given to the same parts as those of the first embodiment described above with respect to FIGS. 1 and 2, and detailed description thereof will be omitted. In the first embodiment, the arrangement direction of the batteries 21 is the left-right direction shown in FIGS. 1 and 2, and in the second embodiment, the direction orthogonal to both the arrangement direction and the up-down direction of the batteries 21 is the left-right direction. ..

The major difference between the first embodiment and the second embodiment is the connection of the terminal bus bar 33. In the first embodiment, the third lower module bus bar 26 is used as the first conductive member, and the third lower module bus bar 26 and the terminal bus bar 33 are connected by bolts 4. On the other hand, in the second embodiment, the circuit breaker 23 is used as the first conductive member, and the circuit breaker 23 and the terminal bus bar 33 are connected by bolts 4.

The battery pack 1 includes a lower module 2, an upper module 3, a bolt 4, an O-ring 5, and an insulating cover 6. First, the lower module 2 will be described. The lower module 2 includes a battery 21, a lower cover 22, a circuit breaker 23, a first lower module bus bar 24 (not shown in FIGS. 3 and 4), a second lower module bus bar 25, a bolt 27, and the like. have. That is, in the first embodiment, the third lower module bus bar 26 is provided, but in the second embodiment, it is not provided. Therefore, in the second embodiment, the bolt 28 is not provided either.

Since the battery 21 is the same as that of the first embodiment described above, the same reference numerals are given and detailed description thereof will be omitted. The lower cover 22 has a lower cover main body 221 and an inner cover 222. Since the lower cover main body 221 is the same as that of the first embodiment described above, the same reference numerals are given and detailed description thereof will be omitted. The inner cover 222 is provided with a through hole 222A as in the first embodiment, but is not provided with an insert nut 222B. Further, the circuit breaker 23 is mounted on a bottom raising table 29 arranged above the inner cover 222.

The upper module 3 includes an upper cover 31, a terminal 32, a terminal bus bar 33, and a bolt 34. The upper cover 31 has an upper wall 311 and 312, a side wall 313, and a peripheral wall 314, as in the first embodiment. Further, in the first embodiment, the through hole 312A and the metal collar 312B for inserting the bolt 4 are provided in the upper wall 312, but in the second embodiment, the through hole 313A and the metal collar for passing the bolt 4 are provided. The 313B is provided on the side wall 313. As a result, the through hole 313A penetrates in the left-right direction.

In the second embodiment, the terminal bus bar 33 includes a sixth electric portion 33C stacked on the lower side of the upper wall 312 and a seventh conductive portion 33D protruding upward from the left end portion of the sixth conductive portion 33C and superposed on the side wall 313. , Is formed in an L shape. The sixth conductive portion 33C is provided with a through hole 33A for passing the bolt 34 in the portion overlapping the terminal 32. The seventh conductive portion 33D is provided with a through hole 33B for passing the bolt 4 in a portion overlapping the through hole 313A of the upper cover 31. The through holes 313A and 33B of the upper cover 31 and the seventh conductive portion 33D described above are the bottom raising base 29 so as to be overlapped with the connection portion 232 on the right side of the circuit breaker 23 in a state where the lower module 2 is assembled to the upper module 3. The height of the is adjusted.

Next, the procedure for assembling the battery pack 1 having the above-described configuration will be described. As in the first embodiment, the lower module 2 and the upper module 3 are assembled respectively. The assembly of the lower module 2 will be described in detail. A plurality of batteries 21 connected in series using the first lower module bus bar 24 are housed in the lower cover main body 221. Next, the first conductive portion 25A of the second lower module bus bar 25 is superposed on the electrode of the battery 21.

Next, the inner cover 222 is attached so as to close the opening of the lower cover main body 221. At this time, the second conductive portion 25B is passed through the insertion hole 22A of the inner cover 222, and the second conductive portion 25B is projected upward from the inner cover 222. Next, the bottom raising table 29 is arranged above the inner cover 222, and the circuit breaker 23 is further arranged on the bottom raising table 29. Then, the second conductive portion 25B is connected to the connection portion 231 of the circuit breaker 23 by the bolt 27. This completes the assembly of the lower module 2.

Next, the assembly of the upper module 3 will be described in detail. Similar to the first embodiment, the terminal bus bar 33 is attached to the terminal 32 attached to the upper cover 31 by using the bolt 34. This completes the assembly of the upper module 3.

Next, the upper module 3 is assembled to the lower module 2. At this time, the upper cover 31 is attached to the outside of the peripheral wall 221B of the lower cover main body 221 so as to cover the inner cover 222. When the lower module 2 and the upper module 3 are assembled, the through hole 313A of the upper cover 31, the through hole 33B of the terminal bus bar 33, and the connection portion 232 of the circuit breaker 23 overlap.

Next, with the bolt 4 inserted into the through hole 313A of the upper cover 31 and the through hole 33B of the terminal bus bar 33, the bolt 4 is screwed into the connection portion 232 of the circuit breaker 23. At this time, the O-ring 5 is sandwiched between the upper cover 31 and the head of the bolt 4. As a result, the terminal bus bar 33 and the circuit breaker 23 are electrically connected, and the terminal 32 is electrically connected to the battery 21. After that, the insulating cover 6 is attached to the upper cover 31 so as to cover the head of the bolt 4, and the process is completed.

According to the second embodiment described above, the bolt 4 is screwed into the connection portion 232 (one of the pair of connection portions 231 and 232) of the circuit breaker 23 in a state of penetrating the terminal bus bar 33 to form the circuit breaker 23 and the circuit breaker 23. Connect the terminal circuit breaker 33. As a result, the bolt 28 does not need to be attached as compared with the first embodiment, and the assembly becomes easier.

Further, according to the second embodiment described above, the lower module 2 has a lower cover main body 221 for accommodating the battery 21 and an inner cover 222 for covering the upper cover 31 side of the lower cover main body 221. , The through hole 222A is provided, the second lower module bus bar 25 protrudes toward the upper cover 31 side through the through hole 222A, and the breaker 23 penetrates the second lower module bus bar 25 protruding toward the upper cover 31 side. In this state, the bolt 27 is screwed into the connecting portion 231 (the other of the pair of connecting portions 231 and 232) to be connected to the second lower module bus bar 25. As a result, the second lower module bus bar 25 can be easily connected to the circuit breaker 23 arranged on the inner cover 222.

Further, according to the second embodiment described above, the connecting portions 231 and 232 are mounted on the inner cover 222 so as to be parallel to the inner cover 222, and the upper cover 31 has a protruding portion protruding from the upper wall 312. A through hole 313A is provided on the side wall 313 (side surface) of the protrusion. As a result, the terminal bus bar 33 can be easily connected to the circuit breaker 23 arranged on the inner cover 222.

According to the above-described embodiment, the circuit breaker 23 is used as the electric component, but the present invention is not limited to this. The electrical component may be a temperature sensor or a voltage detection unit.

The present invention is not limited to the above embodiment. That is, it can be variously modified and carried out within a range that does not deviate from the gist of the present invention.

1 Battery pack 4 volts (1st volt)
21 Battery 22 Lower cover (accommodation)
23 Circuit breaker (first conductive member, electrical component)
221 Lower cover body (accommodation body)
222 Inner cover (middle cover)
222A through hole (second through hole)
222B insert nut (first screw hole)
231 and 232 connection part (second screw hole)
25 Second lower module bus bar (third conductive member)
26 Third lower module bus bar (first conductive member)
27 bolts (2nd bolt)
31 Upper cover (outer cover)
32 Terminal (external terminal)
33 Terminal bus bar (second conductive member)
313 Side wall (side surface)
313A through hole (first through hole)
315 protrusion

Claims (5)

Batteries and
The accommodating part for accommodating the battery and
An outer cover that covers the housing and to which external terminals can be attached,
A first conductive member attached to the housing and electrically connected to the battery,
A second conductive member attached to the outer cover and electrically connected to the external terminal,
A third conductive member attached to the battery and
The outer cover is provided with a first through hole, and the outer cover is provided with a first through hole.
The first conductive member and the second conductive member are electrically connected by a first bolt passing through the first through hole.
The accommodating portion has an accommodating portion main body for accommodating the battery and an inner cover for covering the outer cover side of the accommodating portion main body.
The inner cover is provided with a first screw hole for screwing the first bolt.
The first conductive member is arranged on the outer cover side on the inner cover.
The first bolt is screwed into the first screw hole in a state of penetrating the first conductive member and the second conductive member to connect the first conductive member and the second conductive member.
The inner cover is provided with a second through hole and has a second through hole.
The third conductive member projects toward the outer cover side through the second through hole.
The battery pack is characterized in that the first conductive member is directly or indirectly connected to the third conductive member protruding from the inner cover toward the outer cover. Batteries and
The accommodating part for accommodating the battery and
An outer cover that covers the housing and to which external terminals can be attached,
A first conductive member attached to the housing and electrically connected to the battery,
A second conductive member attached to the outer cover and electrically connected to the external terminal is provided.
The outer cover is provided with a first through hole, and the outer cover is provided with a first through hole.
The first conductive member and the second conductive member are electrically connected by a first bolt passing through the first through hole.
The first conductive member is an electric component provided with a pair of second screw holes.
The first bolt is screwed into one of a pair of second screw holes of the electric component in a state of penetrating the second conductive member to connect the second conductive member and the electric component. Battery pack to do. Further provided with a third conductive member attached to the battery,
The accommodating portion has an accommodating portion main body for accommodating the battery and an inner cover for covering the outer cover side of the accommodating portion main body.
The inner cover is provided with a second through hole and has a second through hole.
The third conductive member projects toward the outer cover side through the second through hole.
The electric component is formed by screwing a second bolt into the other of the pair of second screw holes while penetrating the third conductive member protruding from the inner cover to the outer cover side. The battery pack according to claim 2 , wherein the battery pack is connected to the battery pack. The electric component is mounted on the inner cover so that the second screw hole is parallel to the inner cover.
The battery pack according to claim 3 , wherein the outer cover is provided with a protruding portion protruding outward, and the first through hole is provided on a side surface of the protruding portion. The battery pack according to claim 1 , wherein the outer cover is attached to the outside of the peripheral wall of the housing portion main body.

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